<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	<style>
		div {
			margin-bottom: 10px;
			border: 3px solid red;
		}

		span {
			font-size: 26px;
		}

		p {
			font-style: italic;
		}

		span, .p1, #d1 {
			background: #CCC;
		}
	</style>
</head>
<body>
	<div id="d1">这是DIV1</div>
	<div>这是DIV2</div>
	<p class="p1">这是段落一</p>
	<p>这是段落二</p>
	<span>这是一个SPAN</span>
</body>
</html>